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contains {@link org.jbpm.context.exe.ContextInstance}, the 
central interface class for working with process variables.

{@link org.jbpm.context.exe.ContextInstance} is the class to be used for 
working with variables.  {@link org.jbpm.context.exe.ContextInstance} is 
to be used both from client code outside the scope of a process as well 
as from inside delegation classes that are executed inside the process.
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